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Date: Mon, 22 Jan 2018 12:57:01 -0800
From: syzbot
<syzbot+c9695f0404c72c8f0b7abbac660d986af9008fc5@...kaller.appspotmail.com>
To: dvyukov@...gle.com, linux-kernel@...r.kernel.org, mingo@...hat.com,
peterz@...radead.org, rostedt@...dmis.org,
syzkaller-bugs@...glegroups.com
Subject: possible deadlock in perf_trace_destroy (2)
syzbot has found reproducer for the following crash on
git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/master commit
ebdd7b491b8a65d65936e07004caabca4a3c94a0 (Sun Jan 21 23:21:31 2018 +0000)
Merge branch 'mlxsw-Add-support-for-mirror-action-with-flower'
So far this crash happened 22 times on
git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/master,
linux-next, mmots, upstream.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by:
syzbot+c9695f0404c72c8f0b7abbac660d986af9008fc5@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed.
======================================================
WARNING: possible circular locking dependency detected
4.15.0-rc8+ #1 Not tainted
------------------------------------------------------
syzkaller926009/3663 is trying to acquire lock:
(event_mutex){+.+.}, at: [<00000000df5c386a>]
perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
but task is already holding lock:
(&event->child_mutex){+.+.}, at: [<00000000aedc3ceb>]
perf_event_release_kernel+0x2ea/0xc10 kernel/events/core.c:4260
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (&event->child_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_for_each_child+0x8a/0x150 kernel/events/core.c:4557
_perf_ioctl kernel/events/core.c:4736 [inline]
perf_ioctl+0x35a/0x1430 kernel/events/core.c:4748
vfs_ioctl fs/ioctl.c:46 [inline]
do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_fastpath+0x29/0xa0
-> #4 (&cpuctx_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_init_cpu+0xb6/0x160 kernel/events/core.c:11076
perf_event_init+0x4e9/0x549 kernel/events/core.c:11123
start_kernel+0x4cc/0x819 init/main.c:627
x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378
x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
-> #3 (pmus_lock){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_event_init_cpu+0x2f/0x160 kernel/events/core.c:11070
cpuhp_invoke_callback+0x2ea/0x1d20 kernel/cpu.c:182
cpuhp_up_callbacks kernel/cpu.c:477 [inline]
_cpu_up+0x216/0x510 kernel/cpu.c:1036
do_cpu_up+0x73/0xa0 kernel/cpu.c:1066
cpu_up+0x18/0x20 kernel/cpu.c:1074
smp_init+0x13a/0x152 kernel/smp.c:578
kernel_init_freeable+0x2fe/0x521 init/main.c:1067
kernel_init+0x13/0x180 init/main.c:999
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:541
-> #2 (cpu_hotplug_lock.rw_sem){++++}:
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36
[inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
cpus_read_lock+0x42/0x90 kernel/cpu.c:293
static_key_slow_inc+0x9d/0x3c0 kernel/jump_label.c:123
tracepoint_add_func kernel/tracepoint.c:223 [inline]
tracepoint_probe_register_prio+0x80d/0x9a0 kernel/tracepoint.c:283
tracepoint_probe_register+0x2a/0x40 kernel/tracepoint.c:304
trace_event_reg+0x167/0x320 kernel/trace/trace_events.c:305
perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]
perf_trace_init+0x4ef/0xab0 kernel/trace/trace_event_perf.c:221
perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:7959
perf_try_init_event+0xc9/0x1f0 kernel/events/core.c:9192
perf_init_event kernel/events/core.c:9230 [inline]
perf_event_alloc+0x1cc6/0x2b00 kernel/events/core.c:9494
SYSC_perf_event_open+0x84e/0x2e00 kernel/events/core.c:9949
SyS_perf_event_open+0x39/0x50 kernel/events/core.c:9835
entry_SYSCALL_64_fastpath+0x29/0xa0
-> #1 (tracepoints_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
tracepoint_probe_register_prio+0xa0/0x9a0 kernel/tracepoint.c:279
tracepoint_probe_register+0x2a/0x40 kernel/tracepoint.c:304
trace_event_reg+0x167/0x320 kernel/trace/trace_events.c:305
perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline]
perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline]
perf_trace_init+0x4ef/0xab0 kernel/trace/trace_event_perf.c:221
perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:7959
perf_try_init_event+0xc9/0x1f0 kernel/events/core.c:9192
perf_init_event kernel/events/core.c:9230 [inline]
perf_event_alloc+0x1cc6/0x2b00 kernel/events/core.c:9494
SYSC_perf_event_open+0x84e/0x2e00 kernel/events/core.c:9949
SyS_perf_event_open+0x39/0x50 kernel/events/core.c:9835
entry_SYSCALL_64_fastpath+0x29/0xa0
-> #0 (event_mutex){+.+.}:
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
tp_perf_event_destroy+0x15/0x20 kernel/events/core.c:7943
_free_event+0x3bd/0x10f0 kernel/events/core.c:4104
free_event+0x84/0x150 kernel/events/core.c:4128
perf_event_release_kernel+0x54e/0xc10 kernel/events/core.c:4272
perf_release+0x37/0x50 kernel/events/core.c:4298
__fput+0x327/0x7e0 fs/file_table.c:210
____fput+0x15/0x20 fs/file_table.c:244
task_work_run+0x199/0x270 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x9bb/0x1ad0 kernel/exit.c:865
do_group_exit+0x149/0x400 kernel/exit.c:968
get_signal+0x73f/0x16c0 kernel/signal.c:2335
do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
entry_SYSCALL_64_fastpath+0x9e/0xa0
other info that might help us debug this:
Chain exists of:
event_mutex --> &cpuctx_mutex --> &event->child_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&event->child_mutex);
lock(&cpuctx_mutex);
lock(&event->child_mutex);
lock(event_mutex);
*** DEADLOCK ***
2 locks held by syzkaller926009/3663:
#0: (&ctx->mutex){+.+.}, at: [<000000006557d8ef>]
perf_event_release_kernel+0x2dc/0xc10 kernel/events/core.c:4259
#1: (&event->child_mutex){+.+.}, at: [<00000000aedc3ceb>]
perf_event_release_kernel+0x2ea/0xc10 kernel/events/core.c:4260
stack backtrace:
CPU: 0 PID: 3663 Comm: syzkaller926009 Not tainted 4.15.0-rc8+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
print_circular_bug.isra.37+0x2cd/0x2dc kernel/locking/lockdep.c:1218
check_prev_add kernel/locking/lockdep.c:1858 [inline]
check_prevs_add kernel/locking/lockdep.c:1971 [inline]
validate_chain kernel/locking/lockdep.c:2412 [inline]
__lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3426
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234
tp_perf_event_destroy+0x15/0x20 kernel/events/core.c:7943
_free_event+0x3bd/0x10f0 kernel/events/core.c:4104
free_event+0x84/0x150 kernel/events/core.c:4128
perf_event_release_kernel+0x54e/0xc10 kernel/events/core.c:4272
perf_release+0x37/0x50 kernel/events/core.c:4298
__fput+0x327/0x7e0 fs/file_table.c:210
____fput+0x15/0x20 fs/file_table.c:244
task_work_run+0x199/0x270 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x9bb/0x1ad0 kernel/exit.c:865
do_group_exit+0x149/0x400 kernel/exit.c:968
get_signal+0x73f/0x16c0 kernel/signal.c:2335
do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158
prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264
entry_SYSCALL_64_fastpath+0x9e/0xa0
RIP: 0033:0x445749
RSP: 002b:00007febf72a3db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dac3c RCX: 0000000000445749
RDX: 0000000000000000
View attachment "raw.log.txt" of type "text/plain" (13849 bytes)
View attachment "repro.syz.txt" of type "text/plain" (1174 bytes)
View attachment "repro.c.txt" of type "text/plain" (7878 bytes)
View attachment "config.txt" of type "text/plain" (135631 bytes)
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